Process of producing bearing-apertures in trap-springs.



D. W. KELLEY.

PROCESS OF PRODUCING BEARING APERTURES m TRAP SPRINGS.

APPLICATION FILED HJNE 24,1914.

Patented July 9, 1918.

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DONALD W. KELLEY, .0 QNE DA, NEW YORK.

rnocnssor raonnolue BEABINGAPEBTURES In TRAP-SPRINGS.

1,272,051,, i Specification of Letters Batent. fateuted July 9, 1918 4Application filed June 24, 1914. Serial No. 846,973.

To all whom it may concern.- view of that portion of the spring operatedBe it known that I, DONALD W. KELLEY, upon in the steps shown in Figs. 2and 8; residing at Oneida, in the county of Madison and and State of NewYork, have invented cer- Fig. is a plan view of that portion of the 60 5tain new and useful Improvements in Procspring illustrated in Fig. 4,and illustrating esses of Producing Bearing-Apertures in that portion ofthe spring with which this Trap-Sprmgs, of which the following is ainvention deals when said portion is in its specification. completedcondition ready for use.

This 'invention relates to an improvement Referrlng to the drawings fora detailed 65 i 10 in animal'traps, and particularly that classdescription of the invention, the reference of traps commercially knownas steel character L indicates the spring of the trap. traps. Thesetraps employ a pair of pivoted This spring is formed of a single sheetof jaws movable to gripping position under the metal bent upon itself toV-shape, and the impulse 'of a powerful leaf spring which is oppositeends of the V are enlarged and pro- 70 formed with a bearing partarranged to slide vided with apertures as H and 2. The aperalong legportions of said jaws. ture H is designed to engage about a portlon Theparticular object of the invention is of the trap as clearly seen inFig. 1, and the to improve the formation and construction aperture 2 isdesigned to slide longitudinally of the bearing portion of the spring,the imupwardly along the legs 8 of the jaws 4 of 75 provement belngdirected toward facilitatthe trap for swinging said jaws together 1n inga smoother and quicker operation of the a well understood manner whichneed not be sprlng and jaws, and toward lmprovlng the further describedhere. wearlng quallties of the aws and of the en-; In this operatlon'the edge surfaces of gaging or bearing'portion of the spring. thematerial of the spring L which define 80 A more particular object is toprovide a the aperture 2 obviously engage against the condensed andhardened, smooth and roundedge surfaces of the legs 8, and the ease withed, surface upon the bearing portion of the which these edge surfacesmove relatively to spring. each other depends to a considerable extentThe invention particularly relates to anew upon the decree of frictionset up therebe 85 and improved process by which the above tween. Asordinarily constructed the aperresults may be obtained. ture 2 is formedby simply punching out a Other objects and aims of the invention,portion of the material. This operation, as more or less specific thanthose referred to heretofore performed, leaves sharp and ragabove, willbe in part obvious and in part ged edges for engaging the legs 8. Such 0pointed out in the course of the following ragged and sharp edges causea certain de- Figure 1 is a perspective view of a spring rounded as at5.

Fig. 2 is an enlarged transverse, sectional structure. The compres tionof the elements, combinations, gree of mutilation of the legs 3 andresult in ts and applications of a more or less defective structure.principles, constituting the invention; an By myimproved method ofpunching the the scope of protection contemplated will be aperture 2 theedges of said aperture are indicated in'the appended claims. rounded asclearly illustrated in the steps In the accompanying'drawings which areshown in Figs. 2 and 3 of the drawings.

f this specification, and In these figures it is seen that the punch asto be taken as a part 0 in which I have shown a merely preferred G isformed of two diameters, and the shouldiameters is concavely form ofembodiment of the invention. der between said This rounded shoulder isce with the pr0v1- brought into engagement with the edge 6 of andillustrating in the aperture as the punch moves downwardly, and pressesthe material of said the remainder of the sion of material in tion ofthe spring in this operation of rounding the edge 6 produces anappreciable condensation of the Fig. 3 is a view similar to Fig. 2,illusmolecules of metal adjacent the inner surtrating a further step inthe production of face of the aperture, and a consequent hard- 55 theimproved spring; ening thereof, so that not only is the con- Fig. 4g isan enlarged, transverse, sectional fining wall of the aperture roundedand,

descrip arrangements of par constructed in accordan sions of thisinvention, dotted lines the complete trap in connection with which thespring is utilized; edge backwardly into view illustrating a por theprocess of formation;

smoothed in conformity with the shape of the portion of the punch G, butsaid confinlng Walls are simultaneously hardened In this Waythe surfaceof the aperture 2 which engagesthe legs 8 of'the jaws 4 is made capableof moving along saidlegs with.

a minimum of friction and with little likelihood of mutilationeither-aofethe Walls of the aperture or of the legs of the jaws.

lSpeeiaLattention may be directed to the fact that the legs 3' of thejaws; are pro vided with enlargements as at 7, for the our oseofreceivin the u, award bl'ow vfrom present rounding corners, forreceiving theblow from the spring. 7 portion of the spring isallowedto-retain a sharpcorner at the upper end of the aperthespringwhen the-trap is released. Ojw ing to the fact that the jaws 4rare-usuallycast of, malleable iron, the enlargements When, theimpacting ture, as is the present unive'sal practice, such sharp cornerbites or digs into the relativelysoft rounding cornersoi theenlargements 7,1

' ail-chatter a few operations, causes portions of the material of saidrounding corners tobe cu't and curled upto a greater or less =e j--tent. This curled up 'matenial formsqa I shanp knife-like edge, and'isthe source-goir much annoyanceanddanger in handling the trap. It isapparent, however, that when the upper endof the apertureyforming the,impacting portion ofthe spring,; 1is rounded Iandthe entire' wallsurfaceof the aperture oribearin-g-is hardened as in accordance with materialof the. jaws is obviated. v V v While-th'e drawings and" descriptioncomthe present invention, such cutting of the prisin g this applicationare, particularly spring for animal traps, it is, however, ap

parent that the rounded and hardened bearing formed upon the spring mayaswell'be formed upon other articles than springs, and

in fact, rounded and hardened lo earings, of the type described may bemanufactured fornumerous: purposes within the scope of this invention. Q7' It is of courseintended.-that..;alli-;matter; contained in theaboare-gdescription, and shown ,in =the accompanying drawing, shall; beinterpreted as illustrative-only, and not in a limiting sense,, andthat-the following; claim is intended to cover all the generic andspecific features of -theinvention which may be said to fall within thelanguageot saidclaim, i

.Having thus describedmy invention what; I claiin as new and desire .tosecure by LettersPatenh is-z -.'1ihe herein describedprocess ef.Yprodue-i ing a hearing aperture in a spring "for (animal traps, whichconsists in, first: forming] an aperture at. one end ofthe spring, the

wallsof'said aperture being substantiallyiat V r rightangles. totheupper rsurtace' ofsaid spring, and then pressing he upper gannular'corner portlon oi" the wallsof said aper.

tune to make said corner portion round vand:

itnesses V W.- ScHNEELooH, I SIGRID-AHRENSM copies otthis-jidtent maybeobtained for five cents each, addressing the (lomm-issionerot iWashingtdmfifi. I j I I 5 c DONALDW, ELLEY, r V

